when you embed a gallery using the CMS it adds an img tag, for example:
<img design="grid_lightbox" id="1" name="powergallery" src="http://localhost/ps453/galleries/grid_lightbox/admin/dark_large.png" style="display:block" theme="dark" />
on the page you want to display the gallery, make sure it is using the power store theme, and add the following code to show the gallery:
<?php $gallery = '<img design="grid_lightbox" id="1" name="powergallery" src="http://localhost/ps453/galleries/grid_lightbox/admin/dark_large.png" style="display:block" theme="dark" />'; ?>
<?php echo wa_evaluate($gallery); ?>